Oxidationskapazitaet der marinen Atmosphaere

Description: Die Oxidationskapazitaet der Atmosphaere ist bestimmt durch die Konzentration an Hydroxyl(OH)-Radikalen. Mit diesem Projekt soll die breitengradabhaengige Verteilung der OH-Konzentration in der marinen Grenzschicht ueber dem Atlantischen Ozean bestimmt werden. Dazu werden OH-Messungen mittels differentieller Absorptionsspektroskopie (DOAS) an Bord eines Forschungsschiffes gemacht. Gleichzeitig werden andere Parameter - wie O3, NOx, KW, PAN und H202 - gemessen, die die OH-Konzentration bestimmen. Aus Messungen von Dimethylsulfid (DMS) soll die Bildung von SO2 und Sulfat-Aerosolen durch die Oxidation von DMS durch OH abgeschaetzt werden.

SupportProgram

Tags: Ozon ? Wasserstoffperoxid ? Atmosphärisches Aerosol ? Peroxyacetylnitrat ? Sulfat ? Dimethylsulfid ? Aerosol ? Laser ? Stickstoffdioxid ? Umweltcontrolling ? Absorption ? Messprogramm ? Methan ? Schwefeldioxid ? Stickoxide ? Oxidation ? Schiff ? Meeresgewässer ? Forschungsschiff ? Atmosphäre ? Forschungseinrichtung ? Grenzschicht ? Kenngröße ? Globale Aspekte ? Atlantischer Ozean ? Ozean ? Absorptionsspektralanalyse ? Aerosolentstehung ? Hydroxylradikal ? MSA ? Oxidationskapazitaet ? Radikal [Chemie] ?

Region: Nordrhein-Westfalen Nordrhein-Westfalen

Bounding boxes: 5.8663153° .. 9.4617417° x 50.3226897° .. 52.531493499999996° 5.865998792060539° .. 9.459868448414449° x 50.32269894467417° .. 52.53157696320851°

License: Creative Commons Namensnennung-keine Bearbeitung-Nichtkommerziell 4.0

Language: Deutsch

Organisations

• Europäische Kommission (Mitwirkung, Finanzielle Förderung)
• Forschungszentrum Jülich (Projektverantwortung)
• Umweltbundesamt (Bereitstellung)
• University Iraklion, Division of Environmental Chemistry (Mitwirkung)

Last harvest: 16.10.2026 00:38

Time ranges: 1996-02-01 - 1998-01-31

Alternatives

• Language: Englisch/English
  Title: Marine Atmosphere Oxidation Capacity Experiment
  Description: A measurement campaign onboard the German research vessel POLARSTERN will be performed to measure the latitudinal distribution of the OH radical concentration in the marine boundary layer (MBL) over the Atlantic Ocean. The comparison of measured data with the predictions of a tropospheric OH photochemistry model provides an ultimate test of this model. The measured OH data will be used for the assessment of the oxidation of dimethyl sulphide (DMS) which is the dominant sulphur containing gas in surface marine waters. The proposed project will investigate the OH induced formation of the DMS oxidation products SO2, methanesulphonic acid (MSA), and non-sea-salt sulphate (nss-SO4) and the role they play in the formation of submicrometer aerosol particles in the MBL. These aerosol particles strongly affect the global radiation budget; the climate forcing due to sulphate aerosols is currently estimated to be comparable to that of greenhouse gases but opposite in sign. The project tasks are: Measurement of the concentration of OH radicals and their latitudinal distribution in the MBL over the Atlantic Ocean during a ship cruise using laser ling-path absorption spectroscopy. Simultaneous measurements of parameters important in controlling the OH concentration, including O3, H2O, NO, NO2, NOy, CO, CH4, PAN, H2O2, HCHO, CH3CHO, NMHC, photolysis rates, and meteorological parameters. Test and improvement of a box model used for the description of the fast OH photochemistry. Model studies of the sensitivity of the OH concentration to anthropogenic perturbations in the remote MBL. Determination of the oceanic source strength and the OH controlled lifetime of DMS in the MBL. Assessment of the role of DMS oxidation products in the formation of sub-micrometer aerosol particles and cloud condensation nuclei. Evaluation of the impact of transport on the measured distribution of trace gases, nss-SO4, and MSA concentrations using a 3-D transport chemistry model.
  URL: https://ufordat.uba.de/UFORDAT/pages/PublicRedirect.aspx?TYP=PR&DSNR=47519

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